DESCRIPTION

· TOPSwitch™-FX integrates high-voltage power MOSFET, PWM control, and fault protection on a single CMOS chip.

· Features two added terminals: MULTI-FUNCTION (M) pin and FREQUENCY (F) pin (Y package only).

· Offers programmable line OV/UV shutdown, line feed-forward, and DC MAX reduction.

· Supports remote ON/OFF and oscillator synchronization to an external signal.

· Provides half frequency option when FREQUENCY pin is connected to CONTROL instead of SOURCE.

· Operates in three-terminal TOPSwitch mode with enhanced features like soft-start, cycle skipping, and frequency jittering.

· Delivers 10% to 15% higher power capability compared to TOPSwitch-II devices.

FEATURES

· Fully integrated soft-start minimizes stress and overshoot.

· Externally settable accurate current limit.

· Wider duty cycle for increased power and smaller input capacitor.

· Line under-voltage (UV) detection and overvoltage (OV) shutdown.

· Line feed-forward with maximum duty cycle (DCMAX) reduction.

· Single resistor sets OV/UV thresholds and DCMAX reduction.

· Frequency jittering reduces EMI and filtering costs.

· Regulates to zero load without dummy loading.

· 132 kHz frequency reduces transformer and power supply size.

· Hysteretic thermal shutdown with automatic recovery.

· Standard packages with omitted pins for large creepage.

· Active-on and active-off remote ON/OFF capability.

· Synchronizable to a lower frequency for EcoSmart™ energy efficiency.

APPLICATIONS

· Non-ventilated enclosed adapters with typical continuous power measured at 50°C ambient.

· Open frame designs with maximum practical continuous power and adequate heat sinking.

· Suitable for video applications with half frequency option.

· Ideal for systems requiring shutdown/wake-up via LAN or input port.

· Used in designs where cycle skipping reduces no-load consumption.

· Applicable for high efficiency standby with half frequency option.